STOCK-BASED COMPENSATION - DEFERRED RETENTION STOCK/NON-EMPLOYEE DIRECTOR STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Scheduled to Vest Immediately | Director
Shares
Granted (in shares)	28,080	29,996	24,044
Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 47.65	$ 41.67	$ 49.58
Deferred retention stock
Shares
Outstanding at beginning of period (in shares)	477,957	328,093	231,267
Granted/Vested (in shares)	147,655	155,188	134,941
Delivered (in shares)	(191,115)	(5,089)	(38,115)
Forfeited (in shares)		(235)
Outstanding at end of period (in shares)	434,497	477,957	328,093
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 42.07	$ 41.74	$ 39.16
Granted (in dollars per share)	46.94	42.55	45.85
Vested (in dollars per share)	46.94	42.55	45.85
Delivered (in dollars per share)	38.95	35.86	40.67
Forfeited (in dollars per share)		42.55
Outstanding at end of period (in dollars per share)	$ 45.10	$ 42.07	$ 41.74
Total Fair Value of Vested Shares
Delivered	$ 8,906	$ 213	$ 1,517